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/* compile with
*
* gcc -g -Wall assemble-animated.c `pkg-config vips --cflags --libs`
*/
#include <stdlib.h>
#include <vips/vips.h>
/* for libvips before 8.16, add this line:
* G_DEFINE_AUTOPTR_CLEANUP_FUNC(VipsImage, g_object_unref)
*/
int
main(int argc, char *argv[])
{
if (VIPS_INIT(argv[0]))
vips_error_exit(NULL);
if (argc < 3)
vips_error_exit("usage: %s outfile infile1 infile2 ...", argv[0]);
/* Load a set of input files.
*/
g_autoptr(GPtrArray) frames = g_ptr_array_new_full(argc, g_object_unref);
for (int i = 2; i < argc; i++) {
VipsImage *frame;
if (!(frame = vips_image_new_from_file(argv[i],
"access", VIPS_ACCESS_SEQUENTIAL,
NULL)))
vips_error_exit(NULL);
g_ptr_array_add(frames, frame);
}
/* Combine to form a vertical strip.
*/
g_autoptr(VipsImage) strip;
if (vips_arrayjoin((VipsImage **) frames->pdata, &strip, frames->len,
"across", 1,
NULL))
vips_error_exit(NULL);
/* Set the animation metadata. Delay times are in milliseconds.
*/
VipsImage *frame0 = VIPS_IMAGE(frames->pdata[0]);
vips_image_set_int(strip, "page-height", frame0->Ysize);
vips_image_set_int(strip, "loop", 10);
int delays[] = { 300, 300, 300 };
vips_image_set_array_int(strip, "delay", delays, VIPS_NUMBER(delays));
if (vips_image_write_to_file(strip, argv[1], NULL))
vips_error_exit(NULL);
return 0;
}
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